Control and autoalignment at the HOPTF
The High Optical Power Test Facility (HOPTF) in Gingin, Western Australia, will study the effect of high circulating optical power on test mass coatings and substrates of a suspended cavity. To enable this study, longitudinal locking of a high power laser to the cavity, and automatic alignment to the cavity optical axis are required. We have designed and implemented the optical system and electronics for the feedback control for the Facility in Gingin. Longitudinal control is achieved with the Pound-Drever-Hall frequency locking technique, while autoalignment employs a technique involving wavefront sensing.